API 5L X56 steel pipe is designed for use in pipeline transportation systems in the oil and gas industry. Here are the key specifications:

Grade: X56

Standard: API 5L

Pipe Type: Seamless or welded

Wall Thickness: Ranges from 4.0 mm to 25.4 mm

Outer Diameter: Typically from 114.3 mm to 1219.2 mm

Chemical Composition:

Carbon (C): ≤ 0.12%

Manganese (Mn): 1.2% - 1.6%

Phosphorus (P): ≤ 0.03%

Sulfur (S): ≤ 0.03%

Silicon (Si): ≤ 0.40%

Chromium (Cr): ≤ 0.30%

Nickel (Ni): ≤ 0.30%

Molybdenum (Mo): ≤ 0.10%

Mechanical Properties:

Yield Strength: ≥ 380 MPa

Tensile Strength: 550 - 690 MPa

Elongation: ≥ 20%

Heat Treatment: Normalized or as rolled

Application: Used for transporting natural gas, oil, and water in pipelines.

Make sure to refer to the latest API 5L specifications for any updates or additional requirements.